Multiple PUCCH Resources for UCI Reliability
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and NR networks, the reliability of uplink control information (UCI) reporting over unlicensed spectra is compromised due to unreliable configuration of single physical uplink control channel (PUCCH) resources, leading to potential failure in feedback of critical information like HARQ-ACKs, especially when listen before talk (LBT) access procedures fail.
Innovation Solution
Configuring multiple PUCCH resources distributed across different subbands within a bandwidth, allowing the user equipment (UE) to select available resources for UCI transmission, thereby improving reliability and reducing the risk of transmission failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single PUCCH resource is configured for UCI transmission, then the device complexity is reduced, but the reliability of UCI reporting deteriorates due to potential LBT access failures
Solution Approach 1:
The patent divides the single PUCCH resource into multiple PUCCH resources distributed across different subbands. Each PUCCH resource is associated with a specific subband, allowing the UE to select from multiple candidates based on LBT access success, thereby improving reliability without excessive complexity
Solution Approach 2:
The patent changes the parameter of PUCCH resource distribution by spreading resources across different frequency subbands instead of using a single centralized resource. This parameter change enables frequency diversity and improves reliability against LBT failures in specific subbands
2Reliability
If multiple PUCCH resources are configured across different subbands, then the reliability of UCI reporting is improved, but the device complexity increases
Solution Approach 1:
The patent segments the UCI transmission resources into multiple PUCCH resources, each tied to a specific subband. This segmentation allows the system to achieve diversity gain while maintaining manageable complexity through structured resource organization
Solution Approach 2:
The patent configures multiple PUCCH resources but the UE only needs to select and use one successful resource for transmission. This partial action approach provides redundancy without requiring all resources to be actively managed simultaneously, reducing effective complexity
3Loss of information
If multiple candidate PUCCH resources are provided, then the loss of information is reduced due to failed feedback, but the quantity of resources required increases
Solution Approach 1:
The patent segments PUCCH resources across different subbands, allowing information feedback to be transmitted through alternative paths if one subband fails LBT access, thereby reducing information loss without requiring excessive redundant resources
Solution Approach 2:
The patent applies local quality by associating specific PUCCH resources with specific subbands, allowing the system to optimize resource usage locally in each subband while maintaining overall efficiency through selective resource activation
Data Source
AI summary
A method for providing multiple physical uplink control channel (PUCCH) resources for a uplink control information (UCI) report can include receiving one or more PUCCH resource configurations from a base station (BS) at a user equipment (UE) in a wireless communication system, and determining a first PUCCH resource configuration from the one or more PUCCH resource configurations for reporting a UCI. The first PUCCH resource configuration can indicate multiple frequency domain transmission occasions in a bandwidth. The UCI can be transmitted on at least one of the multiple frequency domain transmission occasions indicated by the first PUCCH resource configuration.